Highly touted lefty Texas prospect Martin Perez will be out at least a couple months after breaking his left arm -- his pitching arm -- during a Cactus League game Sunday.

The Rangers' No. 6 prospect and MLB.com's No. 95 overall was struck by a line drive hit by Seattle's Brad Miller in the sixth inning of the 7-6 spring loss.

"When I moved my hand [after being struck], I felt a little break," Perez told MLB.com. "When the doctor said, 'OK, you have to take four weeks,' I said, 'OK, I'm done for this month,' and I set my mind to what I need to do now."

X-rays revealed a fracture of the ulna bone in his left forearm.

"I don't want to think a lot about [the injury]," Perez said. "I just want to be focused on what I need to do to be ready in a couple months and help the team."

Texas general manager Jon Daniels hopes Perez will be able to return to action about a month into the season.

"I feel for Martin -- he looked like he's figuring some thing out," Daniels said. "He'll bounce back. ... We'll look around at external options, but I expect to go internally at this point. Knock on wood -- hope to get [him] back a month into the season, give or take."

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The 21-year-old Venezuelan went 7-6 with a 4.25 ERA in 127 innings with Triple-A Round Rock last season. He struck out 69 and walked 56.

He made his Major League debut on June 27, allowing four runs in 2/3 innings against Detroit. In 12 appearances at the big league level with Texas, he went 1-4 with a 5.45 ERA in 38 frames overall.

Perez had been a possible candidate to win the fifth starter job with the Rangers, though now it's not expected he'll throw for about four weeks before rehabbing another month.

This story was not subject to the approval of the National Association of Professional Baseball Leagues or its clubs.